add: Sorting leaderboard results by the Average column

src/process_leaderboard_data.py

@@ -101,6 +101,7 @@ class Leaderboard():
 
         # Map model names to hyperlinks using the link_dict.
         leaderboard_dataframe['Model'] = leaderboard_dataframe['Model'].map(lambda model: f"[{model}]({self.link_dict.get(model, '')})")
+        leaderboard_dataframe.sort_values(by='Average', ascending=False, inplace=True)
 
         return leaderboard_dataframe